CN103560837A - Real-time medical communication system based on current coupling type human body communications and communication method thereof - Google Patents
Real-time medical communication system based on current coupling type human body communications and communication method thereof Download PDFInfo
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Abstract
The invention discloses a real-time medical communication system based on current coupling type human body communications and a communication method of the real-time medical communication system, and belongs to the field of human body communications, wherein the problem that an existing whole system of capacity coupling type human body communications is poor in adaptation and stability is mainly solved. The real-time medical communication system comprises a power module, a transmitter and a receiver, wherein the transmitter and the receiver are respectively connected with the power module and installed on a human body. The communication method of the real-time medical communication system comprises the steps that a medical signal of the human body is converted into a differential current signal suitable for transmission of human tissues through the transmitter, the differential current signal is transmitted to a patch electrode through a guide line and is injected into the human tissues through the patch electrode, a voltage signal in the human tissues is collected and transmitted to the receiver, and the receiver detects voltage of two different positions on the human body so as to obtain the medical signal. Information is transmitted by safely and stably using the human body as a medium without affecting the normal physiological status of a person, and the real-time medical communication system based on the current coupling type human body communications and the communication method of the real-time medical communication system are suitable for being popularized and used on a large scale.
Description
Technical field
The present invention relates to a kind of medical communication system and communication means, be specifically related to a kind of real time medical communication system and communication means thereof based on current coupling type human body communication, belong to human body communication field.
Background technology
Human body communication (Intra-body Communication, IBC) be a kind of emerging short distance " wireless " communication mode, its maximum feature is to utilize human body as the transmission ature of coal of ultra-weak electronic signal, to realize human body surface, inside, the transfer of data between all electronic installations that can contact with human body and sharing such as around, compare and common are line and wireless connect technology, IBC has not only removed miscellaneous line from, has the features such as power consumption is little, radiation is faint, with low cost, fail safe is good concurrently simultaneously.The human body communication technology of present stage can realize body surface, signal between a series of Wearable/implantable medical transducer/instruments such as body is interior is mutual and shared, thereby building physiology signal obtains, analyze and basic platform-body area network of processing, to reducing equipment cost, when simplifying the operation step, improve monitoring quality, this novel health supervision pattern is for user, and the Collaborative Control and the parameter that are not only conducive to each transducer merge, and be convenient to user self health status is made tentatively, objective, comprehensively evaluate, more can be by human body base station/server by the physiological parameter detecting, evaluation result is by public network (GSM, 3G) be sent to the service platform of community or hospital, for professional health care personnel, make last diagnostic, be particularly useful for needs real-time, continuously, the long-time medical monitoring occasion that detects various human body physiological characteristics parameters, such as chronic disease, geriatric disease patient, disabled person's monitoring and sportsman, spacefarer's status monitoring.
Present stage, human body communication technology can be divided into capacitive coupling type and current coupling two classes, the whole system of capacitive coupling type is comprised of transmitting terminal, human body, receiving terminal three parts, transmitting terminal and receiving terminal have respectively signal patch electrode and the patch electrode that is coupled over the ground, signal patch electrode is used for sending and detection signal, this patch electrode can contact with human body, also can be near the skin of human body; The patch electrode that is coupled be over the ground mainly for produce signal to earth-return.These all can only concentrate on human body surface and carry out, communication also only limits to the communication on surface to surface, cannot go deep into organization internal, this is due in the transmitting procedure of signal, transmitting terminal and receiving terminal must form earth-return, therefore this mode is not suitable for implanted human body communication, and the uncertainty due to loop in human body transmitting procedure, make transceiver design difficulty larger, in this external communication process, the similar outside radiation dispersion of the working method field of patch electrode is over the ground coupled, uncertain factor is too large, very easily be subject to outside electromagnetic interference, thereby cause the adaptability of system and stability to reduce.Current coupling sexual type human body communication is that with capacitive coupling type human body communication difference dispensing device directly contacts with human body with the patch electrode of receiving system, and do not need, with ground, coupling over the ground occurs, for condition has been relaxed in the placement of equipment, and power consumption very low (only needing 8uW), so it is applicable to the communication technology of implanted equipment.
Summary of the invention
The object of the present invention is to provide a kind of real time medical communication system and communication means thereof based on current coupling type human body communication, mainly solved existing capacitive coupling type human body communication because the dependence of earth-return being caused to the adaptability of whole system, the problem of stability decreases.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of real time medical communication system based on current coupling type human body communication, comprise power module, be connected with power module respectively, be installed on the transmitter and receiver on human body simultaneously, for connecting the first patch electrode of human body and transmitter, the second patch electrode, the 3rd patch electrode that connects human body and receiver, the 4th patch electrode, described transmitter comprises the modulation module based on FPGA, the DDS module being connected with modulation module based on FPGA, be connected with DDS module and change difference current module for being connected the single ended voltage of the first patch electrode and the second patch electrode, described receiver comprises the signal receiving module being connected with tissue with the 4th patch electrode by the 3rd patch electrode, the analog multiplier connecting in turn, phase shifter, phase-locked loop, demodulation module based on FPGA, analog multiplier is connected with signal receiving module.
Particularly, the described modulation module based on FPGA comprises the frequency divider for being connected with external clock signal, the selector being connected with frequency divider, the differential phase coding device being connected with selector respectively and internal clock signal generation module, the driver being connected with differential phase coding device respectively with for being connected the serial/parallel converter of medical-therapeutic treatment of human body signal, driver is connected with DDS module.The described demodulation module based on FPGA comprises serial/parallel converter, sampling decision device, the parallel/serial converter connecting in turn, and serial/parallel converter is connected with phase-locked loop, and parallel/serial converter is connected with external screen.
Further, described single ended voltage conversion difference current module comprise connect in turn for to the voltage regulator circuit of input voltage regulation, for single-ended voltage signal is converted to differential voltage signal single ended voltage slip voltage division circuit, for differential voltage signal being converted to the voltage of differential current signal, turn current circuit, voltage regulator circuit is connected with DDS module, and voltage turns current circuit and is connected with the first patch electrode, the second patch electrode.
Described signal receiving module comprise in turn connect for measure the voltage difference between two diverse locations on human body instrument amplifier circuit, for suppress interference signal band pass filter circuit, be used to rear class signal to process the voltage regulator circuit that enough voltage is provided, described instrument amplifier circuit is connected with the 3rd patch electrode, the 4th patch electrode, and voltage regulator circuit is connected with analog multiplier with the demodulation module based on FPGA respectively.
Again further, described driver is AD9834, and DDS module is the DDS module based on AD9834, and analog multiplier is MC1496, and phase shifter is 74LS123, and phase-locked loop is CD4046.
A communication means for the real time medical communication system of current coupling type human body communication, comprises the following steps:
(1) the medical-therapeutic treatment of human body signal collecting is converted to the differential current signal that is applicable to tissue transmission by transmitter, by wire, send patch electrode to;
(2) differential current signal that the patch electrode of connection transmitter is sent transmitter is injected tissue, and the voltage signal that the patch electrode of connection receiver gathers in tissue sends receiver to;
(3) receiver obtains medical signal by the voltage between two diverse locations in patch electrode human body, and is presented on screen.
Particularly, in described step (1), specifically comprise the following steps:
(1a) the medical-therapeutic treatment of human body signal collecting converts the medical-therapeutic treatment of human body signal of serial input to parallel data by serial/parallel converter, then sends into differential phase coding device;
(1b) external clock signal enters selector by frequency divider, internal clock signal generation module produces internal clock signal and enters selector simultaneously, then by differential phase coding device, the signal of input difference phase encoder is converted to the logical signal representing by the relation between two orthogonal signalling of last code element and two orthogonal signalling of current code element;
(1c) logical signal after differential phase coding is by producing the signal needing after AD9834 driver, and the control of then accepting FPGA by the DDS module based on AD9834 produces qpsk modulation signal;
(1d) finally by single ended voltage, change difference current module and qpsk modulation signal is converted to the differential current signal of the 1mA transmitting in applicable tissue, by the first patch electrode and the second patch electrode, inject tissue.
Further, in described step (3), specifically comprise the following steps:
(2a) the medical signal obtaining by the voltage between two diverse locations in the 3rd patch electrode and the 4th patch electrode human body obtains by signal receiving module, MC1496 analog multiplier, 74LS123 phase shifter, CD4046 phase-locked loop the demodulation module that carrier signal sends into based on FPGA successively and carries out demodulation;
(2b) demodulation module that the modulated digital signal of being sent by signal receiving module is sent into based on FPGA simultaneously carries out demodulation.
Again further, in the demodulation module based on FPGA, comprise the following steps:
(1i) by serial/parallel converter, the carrier signal of sending into and modulated digital signal are generated to code element, then through oversampling decision device, after input sync signal, obtain the logical signal of transmission simultaneously;
(2i) again by the logical signal determining by parallel/serial converter, after input sync signal, be converted to data simultaneously and output in screen and show.
Compared with prior art, the present invention has following beneficial effect:
(1) the present invention can not affect under people's normal physiological state, safety, the stable human body that utilizes is realized communication as medium, there is easy to connect, low-power consumption, be not subject to outside noise disturb, to plurality of advantages such as external radiation are less;
(2) dispensing device of the present invention directly contacts with human body with the patch electrode of receiving system, do not need, with ground, coupling over the ground occurs, for condition has been relaxed in the placement of equipment, and power consumption very low (only needing 8uW), because transmitting terminal directly contacts with tissue with receiving terminal, do not need to be coupled over the ground with ground, be therefore applicable to the communication technology of implanted equipment;
(3) the present invention utilizes human body as communication conductor, it can avoid complicated connecting line, development along with microelectric technique, implantable medical device will be more and more small, the required shared space of implanted equipment of human body communication also just becomes more and more less, it is more and more less that the wound of bringing to human body also becomes, and therefore has very large science and market prospects;
(4) electric current that transmitting terminal patch electrode of the present invention the sends human body of flowing through, direct and receiving terminal patch electrode is coupled, so current coupling anti-electromagnetic interference capability is very strong, more stable than capacitive coupling, thereby be conducive to realize high-speed communication, because its wanted carrier frequency is low, voltage and current is all very little, communication security is applicable to large-scale promotion and uses very much.
Accompanying drawing explanation
Fig. 1 is system block diagram of the present invention.
Fig. 2 is human body upper arm patch electrode details drawing of the present invention.
Fig. 3 is the present invention-embodiment single ended voltage conversion difference current modular circuit schematic diagram.
Fig. 4 is the present invention-embodiment signal receiving module circuit theory diagrams.
Fig. 5 is the simulation result figure of the present invention-embodiment.
Fig. 6 is the actual test result figure of the present invention-embodiment.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described, and embodiments of the present invention include but not limited to the following example.
Embodiment
As shown in Fig. 1-Fig. 4, a kind of real time medical communication system based on current coupling type human body communication, it is characterized in that, comprise power module, be connected with power module respectively, be installed on the transmitter and receiver on human body simultaneously, for connecting the first patch electrode of human body and transmitter, the second patch electrode, the 3rd patch electrode that connects human body and receiver, the 4th patch electrode, described transmitter comprises the modulation module based on FPGA, the DDS module being connected with modulation module based on FPGA, be connected with DDS module and change difference current module for being connected the single ended voltage of the first patch electrode and the second patch electrode, described receiver comprises the signal receiving module being connected with tissue with the 4th patch electrode by the 3rd patch electrode, the analog multiplier connecting in turn, phase shifter, phase-locked loop, demodulation module based on FPGA, analog multiplier is connected with signal receiving module.
The described modulation module based on FPGA comprises the frequency divider for being connected with external clock signal, the selector being connected with frequency divider, the differential phase coding device being connected with selector respectively and internal clock signal generation module, the driver being connected with differential phase coding device respectively with for being connected the serial/parallel converter of medical-therapeutic treatment of human body signal, driver is connected with DDS module.The described demodulation module based on FPGA comprises serial/parallel converter, sampling decision device, the parallel/serial converter connecting in turn, and serial/parallel converter is connected with phase-locked loop, and parallel/serial converter is connected with external screen.
Described single ended voltage conversion difference current module comprise connect in turn for to the voltage regulator circuit of input voltage regulation, for single-ended voltage signal is converted to differential voltage signal single ended voltage slip voltage division circuit, for differential voltage signal being converted to the voltage of differential current signal, turn current circuit, voltage regulator circuit is connected with DDS module, and voltage turns current circuit and is connected with the first patch electrode, the second patch electrode.Described voltage regulator circuit comprises the resistance R 1 being connected with DDS module, the swept resistance R2 being connected with resistance R 1, the sliding end ground connection of swept resistance R2, be connected in the operational amplifier U1 between resistance R 1 and swept resistance R2, described single ended voltage slip voltage division circuit comprises the resistance R 3 being connected with operational amplifier U1 output, the operational amplifier U2 that inverting input is connected with resistance R 3, be connected in the resistance R 4 between operational amplifier U2 inverting input and output, the resistance R 5 being connected with operational amplifier U2 in-phase input end, the other end ground connection of resistance R 5, resistance R 6 and the resistance R 7 in parallel with resistance R 3 after series connection, the other end ground connection of resistance R 7, be connected in the operational amplifier U3 between resistance R 6 and resistance R 7.
Described voltage turns the operational amplifier U4 that current circuit comprises that in-phase input end is connected with operational amplifier U2, the operational amplifier U8 that in-phase input end is connected with operational amplifier U4 output, the capacitor C 21 being connected with operational amplifier U8 common port, the other end of capacitor C 21 is connected with the first outside patch electrode, swept resistance R11 simultaneously that be connected with operational amplifier U8 inverting input with operational amplifier U4 inverting input, the operational amplifier U9 that output is connected with swept resistance R11 sliding end, be connected in the capacitor C 3 between operational amplifier U9 inverting input and output, the resistance R 12 being connected with operational amplifier U9 inverting input, the other end ground connection of resistance R 12, be connected in the resistance R 13 between operational amplifier U8 output and operational amplifier U9 in-phase input end, the capacitor C 4 being connected with operational amplifier U9 in-phase input end, the other end ground connection of capacitor C 4, the operational amplifier U5 that in-phase input end is connected with operational amplifier U3 output, the operational amplifier U6 being connected with operational amplifier U5 output, the capacitor C 31 being connected with operational amplifier U6 common port, the other end of capacitor C 31 is connected with the second outside patch electrode, swept resistance R8 simultaneously that be connected with operational amplifier U6 inverting input with operational amplifier U5 inverting input, the operational amplifier U7 that output is connected with the sliding end of swept resistance R8, be connected in the capacitor C 1 between operational amplifier U7 inverting input and output, the resistance R 9 being connected with operational amplifier U7 inverting input, be connected in the resistance R 10 between operational amplifier U6 output and operational amplifier U7 in-phase input end, the capacitor C 2 being connected with operational amplifier U7 in-phase input end, the other end ground connection of capacitor C 2.
Described signal receiving module comprise in turn connect for measure the voltage difference between two diverse locations on human body instrument amplifier circuit, for suppress interference signal band pass filter circuit, be used to rear class signal to process the voltage regulator circuit that enough voltage is provided, described instrument amplifier circuit is connected with the 3rd patch electrode, the 4th patch electrode, and voltage regulator circuit is connected with analog multiplier with the demodulation module based on FPGA respectively.Described instrument amplifier circuit comprises the capacitor C 5 being connected with the 3rd patch electrode, the operational amplifier U10 that in-phase input end is connected with capacitor C 5, after parallel connection, be connected in capacitor C 7 and resistance R 15 between operational amplifier U10 inverting input and output, the resistance R 14 being connected with operational amplifier U10 inverting input, the capacitor C 9 connecting in turn, resistance R 17 and capacitor C 11, capacitor C 9 is connected with operational amplifier U10 output, resistance R 20 and the operational amplifier U12 in parallel with capacitor C 11 after in parallel, the operational amplifier U11 that inverting input is connected with resistance R 14, the in-phase input end of operational amplifier U11 is connected with the 4th patch electrode by capacitor C 6, after parallel connection, be connected in capacitor C 8 and resistance R 16 between operational amplifier U11 inverting input and output, be connected in turn capacitor C 10 and resistance R 18 between operational amplifier U11 output and operational amplifier U12, the capacitor C 12 and the resistance R 19 that after in parallel, are connected with operational amplifier U12 in-phase input end, the other end ground connection of capacitor C 12 and resistance R 19.
Described band pass filter circuit comprises the capacitor C 13 connecting in turn, capacitor C 14, operational amplifier U13, resistance R 23, resistance R 24, operational amplifier U14, capacitor C 13 is connected with operational amplifier U12 output, one end is connected between capacitor C 13 and capacitor C 14, the resistance R 21 that the other end is connected with operational amplifier U13 inverting input, the resistance R 22 being connected with operational amplifier U13 in-phase input end, the other end ground connection of resistance R 22, one end is connected between resistance R 23 and resistance R 24, the capacitor C 15 that the other end is connected with operational amplifier U14 inverting input, the capacitor C 16 being connected with operational amplifier U14 in-phase input end, the other end ground connection of capacitor C 16, described voltage regulator circuit comprises the operational amplifier U15 being connected with operational amplifier U14 output, be connected in the swept resistance R26 between operational amplifier U15 inverting input and output, the sliding end of swept resistance R26 is connected with operational amplifier U15 output, the resistance R 25 being connected with operational amplifier U15 inverting input, the other end ground connection of resistance R 25, the output of operational amplifier U15 is connected with analog multiplier with demodulation module respectively.
Described driver is AD9834, and DDS module is the DDS module based on AD9834, and analog multiplier is MC1496, and phase shifter is 74LS123, and phase-locked loop is CD4046.
A communication means for the real time medical communication system of current coupling type human body communication, comprises the following steps:
(1) the medical-therapeutic treatment of human body signal collecting is converted to the differential current signal that is applicable to tissue transmission by transmitter, by wire, send patch electrode to;
(2) differential current signal that the patch electrode of connection transmitter is sent transmitter is injected tissue, and the voltage signal that the patch electrode of connection receiver gathers in tissue sends receiver to;
(3) receiver obtains medical signal by the voltage between two diverse locations in patch electrode human body, and is presented on screen.
Described step specifically comprises the following steps in (1):
(1a) the medical-therapeutic treatment of human body signal collecting converts the medical-therapeutic treatment of human body signal of serial input to parallel data by serial/parallel converter, then sends into differential phase coding device;
(1b) external clock signal enters selector by frequency divider, internal clock signal generation module produces internal clock signal and enters selector simultaneously, then by differential phase coding device, the signal of input difference phase encoder is converted to the logical signal representing by the relation between two orthogonal signalling of last code element and two orthogonal signalling of current code element;
(1c) logical signal after differential phase coding is by producing the signal needing after AD9834 driver, and the control of then accepting FPGA by the DDS module based on AD9834 produces qpsk modulation signal;
(1d) finally by single ended voltage, change difference current module and qpsk modulation signal is converted to the differential current signal of the 1mA transmitting in applicable tissue, by the first patch electrode and the second patch electrode, inject tissue.
Single ended voltage conversion difference current module, its realization mainly contains three parts and forms: voltage regulator circuit, by regulating R2 to realize the adjusting to input voltage, then forms follower by operational amplifier U1 and export; Single ended voltage slip voltage division circuit, single-ended voltage signal is divided two-way after sending into, the positive input of one route operational amplifier U3, the anti-phase input of a route operational amplifier U2, finally the output at operational amplifier U2 and operational amplifier U3 obtains differential voltage signal; Voltage turns current circuit, and this circuit is selected current feedback operational amplifier U6 and operational amplifier U8, as main element.
Described step specifically comprises the following steps in (3):
(2a) the medical signal obtaining by the voltage between two diverse locations in the 3rd patch electrode and the 4th patch electrode human body obtains by signal receiving module, MC1496 analog multiplier, 74LS123 phase shifter, CD4046 phase-locked loop the demodulation module that carrier signal sends into based on FPGA successively and carries out demodulation;
(2b) demodulation module that the modulated digital signal of being sent by signal receiving module is sent into based on FPGA simultaneously carries out demodulation.
Signal receiving module, the effect of this module is to process the signal that patch electrode detects, this signal can demodulated module well be identified, its realization mainly contains three parts and forms: instrument amplifier circuit, it is poor simultaneously by this signal amplification that voltage between two electrodes is done, and for rear class, processes gain is provided; Band pass filter circuit, the signal that selects the signal in 1kHz-1MHz frequency band to process as next stage; Voltage regulator circuit, because signal has decay after by filter, by this module by the Signal Regulation after filtered device decay to the voltage that is applicable to rear class and processes.
In the demodulation module based on FPGA, comprise the following steps:
(1i) by serial/parallel converter, the carrier signal of sending into and modulated digital signal are generated to code element, then through oversampling decision device, after input sync signal, obtain the logical signal of transmission simultaneously;
(2i) again by the logical signal determining by parallel/serial converter, after input sync signal, be converted to data simultaneously and output in screen and show.
By using Quartus ii9.0 and Modelsim6.4a to connect, adjust, and Multisim11.0 emulation, obtain result as shown in 5, waveform 1, waveform 2 is respectively transmitter patch electrode detection waveform, 3 of waveforms are to realize by oscilloscope internal algorithm the waveform obtaining after waveform 1-waveform 2, and waveform 4 is waveforms of being exported by receiver.
By actual fabrication circuit board, and the result of actual testing human communication result as shown in Figure 6, waveform 2 is the waveforms while dividing current module from the slip of QPSK modulation module input single ended voltage in transmitter, 1 of waveform is the waveform of being exported by receiver.
According to above-described embodiment, just can realize well the present invention.
Claims (10)
1. the real time medical communication system based on current coupling type human body communication, it is characterized in that, comprise power module, be connected with power module respectively, be installed on the transmitter and receiver on human body simultaneously, for connecting the first patch electrode of human body and transmitter, the second patch electrode, the 3rd patch electrode that connects human body and receiver, the 4th patch electrode, described transmitter comprises the modulation module based on FPGA, the DDS module being connected with modulation module based on FPGA, be connected with DDS module and change difference current module for being connected the single ended voltage of the first patch electrode and the second patch electrode, described receiver comprises the signal receiving module being connected with tissue with the 4th patch electrode by the 3rd patch electrode, the analog multiplier connecting in turn, phase shifter, phase-locked loop, demodulation module based on FPGA, analog multiplier is connected with signal receiving module.
2. a kind of real time medical communication system based on current coupling type human body communication according to claim 1, it is characterized in that, the described modulation module based on FPGA comprises the frequency divider for being connected with external clock signal, the selector being connected with frequency divider, the differential phase coding device being connected with selector respectively and internal clock signal generation module, the driver being connected with differential phase coding device respectively with for being connected the serial/parallel converter of medical-therapeutic treatment of human body signal, driver is connected with DDS module.
3. a kind of real time medical communication system based on current coupling type human body communication according to claim 2, it is characterized in that, the described demodulation module based on FPGA comprises serial/parallel converter, sampling decision device, the parallel/serial converter connecting in turn, serial/parallel converter is connected with phase-locked loop, and parallel/serial converter is connected with external screen.
4. a kind of real time medical communication system based on current coupling type human body communication according to claim 3, it is characterized in that, described single ended voltage conversion difference current module comprise connect in turn for to the voltage regulator circuit of input voltage regulation, for single-ended voltage signal is converted to differential voltage signal single ended voltage slip voltage division circuit, for differential voltage signal being converted to the voltage of differential current signal, turn current circuit, voltage regulator circuit is connected with DDS module, and voltage turns current circuit and is connected with the first patch electrode, the second patch electrode.
5. a kind of real time medical communication system based on current coupling type human body communication according to claim 4, it is characterized in that, described signal receiving module comprise in turn connect for measuring the instrument amplifier circuit of the voltage difference between two diverse locations on human body, for suppressing the band pass filter circuit of interference signal, be used to rear class signal to process the voltage regulator circuit that enough voltage is provided, described instrument amplifier circuit and the 3rd patch electrode, the 4th patch electrode is connected, voltage regulator circuit is connected with analog multiplier with the demodulation module based on FPGA respectively.
6. a kind of real time medical communication system based on current coupling type human body communication according to claim 5, is characterized in that, described driver is AD9834, DDS module is the DDS module based on AD9834, analog multiplier is MC1496, and phase shifter is 74LS123, and phase-locked loop is CD4046.
7. according to the communication means of a kind of real time medical communication system based on current coupling type human body communication described in claim 1 ~ 6 any one, it is characterized in that, comprise the following steps:
(1) the medical-therapeutic treatment of human body signal collecting is converted to the differential current signal that is applicable to tissue transmission by transmitter, by wire, send patch electrode to;
(2) differential current signal that the patch electrode of connection transmitter is sent transmitter is injected tissue, and the voltage signal that the patch electrode of connection receiver gathers in tissue sends receiver to;
(3) receiver obtains medical signal by the voltage between two diverse locations in patch electrode human body, and is presented on screen.
8. the communication means of a kind of real time medical communication system based on current coupling type human body communication according to claim 7, is characterized in that, described step specifically comprises the following steps in (1):
(1a) the medical-therapeutic treatment of human body signal collecting converts the medical-therapeutic treatment of human body signal of serial input to parallel data by serial/parallel converter, then sends into differential phase coding device;
(1b) external clock signal enters selector by frequency divider, internal clock signal generation module produces internal clock signal and enters selector simultaneously, then by differential phase coding device, the signal of input difference phase encoder is converted to the logical signal representing by the relation between two orthogonal signalling of last code element and two orthogonal signalling of current code element;
(1c) logical signal after differential phase coding is by producing the signal needing after AD9834 driver, and the control of then accepting FPGA by the DDS module based on AD9834 produces qpsk modulation signal;
(1d) finally by single ended voltage, change difference current module and qpsk modulation signal is converted to the differential current signal of the 1mA transmitting in applicable tissue, by the first patch electrode and the second patch electrode, inject tissue.
9. the communication means of a kind of real time medical communication system based on current coupling type human body communication according to claim 8, is characterized in that, described step specifically comprises the following steps in (3):
(2a) the medical signal obtaining by the voltage between two diverse locations in the 3rd patch electrode and the 4th patch electrode human body obtains by signal receiving module, MC1496 analog multiplier, 74LS123 phase shifter, CD4046 phase-locked loop the demodulation module that carrier signal sends into based on FPGA successively and carries out demodulation;
(2b) demodulation module that the modulated digital signal of being sent by signal receiving module is sent into based on FPGA simultaneously carries out demodulation.
10. the communication means of a kind of real time medical communication system based on current coupling type human body communication according to claim 9, is characterized in that, in the demodulation module based on FPGA, comprises the following steps:
(1i) by serial/parallel converter, the carrier signal of sending into and modulated digital signal are generated to code element, then through oversampling decision device, after input sync signal, obtain the logical signal of transmission simultaneously;
(2i) again by the logical signal determining by parallel/serial converter, after input sync signal, be converted to data simultaneously and output in screen and show.
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| CN105550503A (en) * | 2015-12-08 | 2016-05-04 | 刘益和 | Community medical system based on current coupled mode intra-body communication and realization method thereof |
| CN106250802A (en) * | 2015-12-28 | 2016-12-21 | 北京智谷睿拓技术服务有限公司 | The method and apparatus identifying object |
| CN106618499A (en) * | 2016-12-14 | 2017-05-10 | 深圳先进技术研究院 | Falling detection equipment, falling detection method and device |
| CN108768467A (en) * | 2018-05-25 | 2018-11-06 | 恒玄科技（上海）有限公司 | A kind of communication system and communication means enhancing near-field communication using human body |
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| CN114665982A (en) * | 2022-02-28 | 2022-06-24 | 浙江大学 | Circuit and method based on human body channel communication |
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| CN203554458U (en) * | 2013-11-20 | 2014-04-16 | 张双 | Real-time medical communication system based on current coupling type human body communication |
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| CN104702792A (en) * | 2015-03-20 | 2015-06-10 | 小米科技有限责任公司 | State control method and device, electronic device of terminal screen |
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| CN105550503A (en) * | 2015-12-08 | 2016-05-04 | 刘益和 | Community medical system based on current coupled mode intra-body communication and realization method thereof |
| CN106250802A (en) * | 2015-12-28 | 2016-12-21 | 北京智谷睿拓技术服务有限公司 | The method and apparatus identifying object |
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| CN108768467B (en) * | 2018-05-25 | 2021-06-29 | 恒玄科技(上海)股份有限公司 | Communication system and communication method for enhancing near field communication by using human body |
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